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Author Topic: engine idle  (Read 3057 times)

n/a

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engine idle
« on: January 18, 2006, 21:21:28 »
My engine idle keeps rising when I come to a stop. I hit the pedel & sometimes the ldle goes down,sometimes it doesn't. The thing is...my adjustment on the "throttle body" for the large butterfly is backed all the way off. Any ideas?
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J. Huber

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Re: engine idle
« Reply #1 on: January 18, 2006, 22:16:37 »
Hey Gator. Glad to see your name over here. It sounds like it could be a leak in your braking system -- I think others here have had similar situations. Do a search for things like "idle, brakes, vacuum" and you'll get some ideas...

James
63 230SL
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James
63 230SL

rwmastel

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Re: engine idle
« Reply #2 on: January 18, 2006, 22:20:02 »
John,

Hello and welcome to the Group!

Use the Search tool and look for "venturi".  That's a common name for the intake manifold flap unit.  You'll learn that it needs to be set right and that it's incorrectly used as an idle adjustment.  Here's one good Search result:
http://index.php?topic=1412

Does your idle rise if you have the car out of gear (manual) or in park (auto) and you step hard on the brake pedal?  I'm wondering if you have a vacuum leak in the brake system.
http://index.php?topic=4214,leak
http://index.php?topic=3101,leak

Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both  tops
1994 E420
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Rodd

Did you search the forum before asking?
2017 C43 AMG
2006 Wrangler Rubicon
1966 230SL auto "Italian"

ja17

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Re: engine idle
« Reply #3 on: January 18, 2006, 22:53:40 »
Hello John and welcome,

If you have a USA delivery 280SL the venturi also has a vacumme idle control dashpot (governor) which regulates idle speed also. If You have this let us know and we can advise.

Joe Alexander
Blacklick, Ohio
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

n/a

  • Guest
Re: engine idle
« Reply #4 on: January 19, 2006, 22:30:44 »
Yeah, sorry! My car is a 66' 230 & it is a grey car, not U.S. but european. 4 speed. If it is the brake system, what might be the problem!
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Benz Dr.

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  • Benz Dr.
Re: engine idle
« Reply #5 on: January 19, 2006, 23:10:43 »
Gator??? ( we know each other )

 Could be sticking flyweights inside of the distributor. Let the engine idle once it's hot and check idle speed. Turn off engine and then re-start without touching the gas pedal. If the idle speed is a lot lower repeat this test again. If it's consistantly lower try driving the car around then let it go back to an idle again. If it's now at a higher idle speed or the speed changes all the time ( sometimes high , sometimes low ) it's likely a sticky distributor.
 Throttle linkage can also affect idle speed. You do have an oil can?



Dan Caron's
 SL Barn
benzbarn@ebtech.net
 slbarn.mbz.org
  1 877 661 6061
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1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC
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